Triple valve lapping tool



Aug. 21-, 1934. J. R. RKCKETTS 9 TRIPLE VALVE LAPPING TOOL firiginalFiled Dec. 5, 192'? r, f If ATTORNEYS.

TRIPLE 'VALVE James R. Ricketts, Richmo National Air Brake Originalapplication Dec 237,959. Divided and 1, 1929, Serial No. 39 17, 1934 4Claims..

This application is a division of my copending application entitledTriple valve lapping machine, filed December 5, 1927, and bearing SerialNumber 237,959, now Patent No. 1,749,890, dated March 11, 1930.

This invention relates to machines for lapping the slide valve seats intriple valves.

It is the principal object of the present invention to provide agenerally improved lapping tool capable of use in expeditiously andaccurately lapping slide valve seats in triple valves.

In carrying out this invention into practice I provide a lapping toolwhich includes a loosely held disk. This disk is formed with a recessextending coaxially therein to a point short of its grinding surface.This recess is engaged by a pin which bears at the bottom of the recessand at the exact center thereof so that applying pressure to the pin,the proper amount of of pressure may be brought to bear on the toolduring the operation thereof. I intend that the diameter of the disk beslightly less than the distance between the sides of the slide valveseat so that the tool may be revolved in opposite directions by hearingagainst opposite sides of the seat on opposite strokes.

One form which the invention may assume is exemplified in the followingdescription and illustrated by way of example in the accompanyingdrawing, in which:

Fig. l is a side elevation of a machine embodying the preferred form ofmy invention with parts in section to more clearly disclose certaindetails of construction.

Fig. 2 is an enlarged view of the partially in section.

Fig. 3 is a perspective view of the lapping tool showing the same invertical section.

Fig. 4 is a bottom plan view of the lapping tool.

Fig. 5 is a diagrammatic view showing the slide valve seat of a triplevalve in plan with the lapping tool passing thereover and in engagementwith one side thereof.

Fig. 6 is a plan view of the machine with parts thereof broken away tomore clearly disclose the arrangement of parts.

Referring more particularly to the accompanying drawing, 10 indicates aframe adapted to be bolted to a base structure or bench. This frame isformed with a suitable bearing 11 within which a shaft 12 is journalled.A crank disk 14 is suitably secured on one end of the shaft. To drivethe shaft and crank disk the other end of the shaft 12 is fitted with alapping tool LAPPING roof.

nd, Calif., assignor to Service, Inc.

ember 5, 1927, Serial No. this application October 6,484. RenewedJanuary 7 loose pulley 15 and a tight pulley 16. These pulleys may beconnected suitable driving motor, not

by a belt 17 to a illustrated.

nected to one end of a con necting rod 24. The f wrist pin 23 isadjustable relative to the center of rotation of the crank disk 14 sothat the stroke of the connecting rod 24 may be varied to suit triplevalves of This is particularly desir that the Stroke of the con thelength of the slide v Valve.

different dimensions. able as it is intended necting rod 24 equal alveseat in-a triple As these triple valves vary in dimensions it isessential that the stroke of the connecting rod 24 be optional mayoperate efficientl sizes.

The frame 10 includes a so that the machine y on valves of differentlower arm 25 which extends longitudinally of the machine in parallel smwith the connecting rod. 24. At is forward end this arm 25 slidablyreceives a socket 26 of a table 27. This table is and its surface ismachine valve and to hold the same disposed horizontally. d to receivea. triple with its axial center in parallelism with the plane of thedisk 14. To

secure the triple valve to is formed with bolt holes the table, thelatter in alignment with the tapped openings in the bottom fiange of thevalve, so that the latter may be secured to the table by bolts. Thebottom flange of the valve is also provided with engage a recess formed,a dowel, which may in the surface of the table so as to properly alignthe valve with respect to the crank dis ing screw 28 engageable w k 14.It will be noticed thatthe socket 26 of the table 2'? is provided at itsbottom w ith a clampith the arm 25. By

loosening this screw 28, the table and the valve may be adjusted alongthe tightening the screw 28 the clamped to the arm 25 in tive to thecrank disk 14.

In parallelism with th vide an upper arm 29 tance above the lower shortof the end thereof.

slidably receives a crosshea bell crank lever 31 is pivote of this lever31 extends machine and is connected arm 25 table in proper and that byay be rigidly position relae lower arm 25, I proarranged a spaced disarm25 and terminating This upper arm 29 d 30 upon which a d. One of thearms transversely of the at its outer end to the forward end of theconnecting rod 24. The

other arm of the bell cra nk lever 31 extends lower end of the recess34c. Thus, when pres longitudinally and forwardly of the machine and isrigidly connected to the rearmost end of a flexible lap carrying arm 33.

The forward end of the arm 33 carries a lapping tool- 34 with which thisapplication isparticularly concerned. The machine just disclosed isfully described and claimed in my copending application above mentioned.

The lapping tool 34 is disk-like and is formed with a peripheral grooveintermediate its top and bottom surfaces. A retainer member 34a issecured to the arm 33 and is fitted with downwardly and inwardly bentends which engage the peripheral groove so as to loosely connect thesure is'exerted on'the arm 33 or the pin 341), the bearing pin 34b willbear on the lap exactly at the center and adjacent its lower or grindingsurface. This causes the entire lapping area of the-lapping tool tobear-on the surface being lapped with equal pressure.

' As shown in Figs; 3 and 4 the working surface .of the lapping tool isformed separately from -This working surface the lapping tool proper. iscupped and-is pressed on the lower end of the lapping tool. After beingpressed into place, four radial slots are cut in the working or wear ingsurface. These slots are'for'thepurposeof retaining the grindingcompound utilized and to distribute it equally over the surface beinglapped.

When the lapping tool is in use on a machine here disclosed, pressure isbrought to bear on the arm 33 by means of a cam 35 and a cam roller Inoperation of the lapping tool here disclosed,

the machine is placed in operation to reciprocate the arm 33. As theconnecting rod 24 moves forwardly toward the triple valve due to thepr'olapping tool is revolved in opposite directions on opposite strokes.

It should be stated that the lapping tool 34 is slightly less indiameter than the dimension between the side walls of the slide valveseat but is greater in diameter than the. width of the seat itself. Thisis clearly illustrated in Fig. 5 of the drawing where represents theside walls of the slide valve seat and 51 represents the sides of thevalve seat proper.

From the foregoing it is obvious that I have provided an improvedlapping tool capable of use in expeditiously and accurately lappingslide valve seats in triple valves.

While I have shown the preferred form of my invention, it is to, beunderstood that various changes may be made in its construction by thoseskilled in the art without departing from the spirit of the invention asdefined in the appended claims.

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

1. A lapping tool for'lapping the slide valve seat in' a triple valve,said tool comprising an arm, a disk having a peripheral grooveintermediate its surfaces, a retaining member fixed to the arm andengaging said groove but permitting an amount of relative movementbetween the disk and the arm, said disk having a recess formedcoaxiallythereof and extending inwardly just short of its grindingsurface, and a bearing inembercarried by the arm and projecting,

within said recess to bear against the bottom of the recess at thecenter of the disk when pressure is placed on the arm.

2.A lapping tool of the character described comprising an arm, a disk,means loosely connecting the disk to the arm, and a' bearing membercarried by the arm and 'engageable with the disk, saidmeans andsaidbearing member cooperating to prevent removal ofthe disk from the'arm,

'3. A lapping'tool of the character described comprising an arm, a diskhaving a peripheral groove formed in its edge intermediate its top andbottom surfaces, and a retaining member carried by the arm and extendinginto said groove and retaining the disk against removal from the arm butpermitting relative movement between the disk and the arm.

"i. A lapping tool of the character described comprising an' arm, adisk, means loosely connecting'the disk to the arm, and a bearing membercarried by the arm and 'engageable with the disk at a point closelyadjacent the working surface thereof, said means and said bearing membercooperating to prevent removal of the disk from the arm.

JAMES R. RICKETTS.

